Dolphin Acoustic Device Characterisation
May 2025 - Australia
Client: Seafood New Zealand
Marine mammal acoustic pingers and deterrent devices are commonly deployed during fishing activities in New Zealand to alert marine mammals to the presence of fishing gear, and/or to deter them from areas of risk or potential feeding opportunities. Hector’s and Māui dolphins (Cephalorhynchus hectori and Cephalorhynchus hectori maui, respectively) are of particular concern for the fishing industry due to their small population sizes and ‘endangered’ and ‘critically endangered’ statuses. JASCO Applied Sciences (JASCO) performed a measurement and modelling study of underwater sound levels associated with two devices that are regularly utilised in New Zealand waters: the Netguard Dolphin Pinger (60 – 120 kHz model); and the STM Dolphin Deterrent Device (DDD) (DDD03H model). It is important to determine the accuracy of manufacturer-supplied technical specifications to ensure devices are operating as expected when deployed. Confirming the technical specifications also improves the understanding of the true extent of potential dolphin awareness and potential displacement around commercial fishing activities while using these devices, and aids in
recommending how to deploy the devices most effectively.